Finding the Fourth Proportional to 117,870.21, 162,661.56 and 64,155.10

Step by Step Solution

1. Step 1: Write the proportion equation
   117,870.21 : 162,661.56 = 64,155.10 : x
2. Step 2: Convert to fraction form
   117,870.21/162,661.56 = 64,155.10/x
3. Step 3: Cross multiply
   117,870.21x = 162,661.56 × 64,155.10
4. Step 4: Simplify right side
   117,870.21x = 10,435,568,647.96
5. Step 5: Solve for x
   x = 10,435,568,647.96/117,870.21
6. Step 6: Final answer
   x = 88,534.40